Calipees



oHARnnsD. sUT'roN; or K NSIQQ; FWW

w CLALIPIEJKS,

Specification bf Letters i Eatent N0. 26,5716, dated To all whom it may concern:

Be it known that I, CHARLES D. SUTTON, of Kensico, in the county of Westchester and State of New York, have invented a certain Improvement in Calipers, the construction and operation of which I have described in the following specification and illustratedin its accompanying drawings with suflicient clearness to enable competent and skilful workmen in the arts to which it pertains or is most nearly allied to make and use my invention.

My said invention is intended to furnish the ready means of measuring either the ra-. dius 0r diameter of a round body, without the necessity of using an instrument of great length for that purpose. It is intended more especially for the use of wheelwrights in measuring wagon hubs, though it may be used advantageously for several other purposes.

The improvement consists in the attach ment to the arms between which the article to be measured is embraced, of a folding arm, with a graduated scale upon it, which.

may be turned out of the way to allow the measurement to be taken and afterward turned backagainst the arms which embrace the work in taking said measurement, to indicate the diameter or radius by means of a scale; said graduated arm being secured with the commencement of measurement in a central position, and in such a manner that the arms which embrace the work must expand equally from the said indicated center, as hereinafter more fully set forth.

Figure 1 of the accompanying drawingsis a plan of the instrument as it would appear when laid upon a table, the indicating arm being folded upon the others in such a manner as to indicate the radius ofthe article measured. Fig. 2 is areverse view showing the other side of the instrument, representing the graduation which indicates the whole diameter. Fig. 3 is a detail view showing the arrangement of the springs for causing the armslto expand equally from the center in reference to the central arm; Fig. 4 is also a detail View transverse to Fig. 3. i It presents the edge of the parts toward the observer. 1

The arms 1 and 2 are made curved as shown, and are hung upon axes 3 and 4., to bars 5 and 6, which form a connecting link between these axes. The arm-7 is attached to the bar 5, by axes 8, 8, upon which or straps 10 and] 11,1 areteach connected} at it is allowed to vibrate. .Th slarm 7, ha i an arc 9,upon it, which is graduated uponki 1 both sides-011 one side it lis igraduatedfinu inches and parts ofianinchitoenable. th operator to read off the radius by foldin the are down upon the. armsafter theinstru ment is set to the sizeofthearticleftolbew measured, the other sideubeing graduated I to half the size of the sameiscale, so that the 65. diameter may be read from. it without th trouble of calculation. 1 l

The arms 1 andQ are fconnected byj two g 1:, light springslO and1l,;jwhichajare attached 1 to the hubs 12 and 13, whichform the rootsJQ S of these arms. These hubs are; cylindrical. upon the outside, so far asgtheyycomegin contact with the springsythisfl circular gpor-ition being concentric with the axes Sand 14:, 1 1 upon which the arms. are hung to. the bars or connecting links5 and 6, Thesesprings w one end to one of? thesefll nbsgand]at the) .1 other end to the other,crossing.jeachotherwfg. between the hubs as shown. They; ,are13 f drawn up to aperfect tension, by. meansjof the screws 14,andj$15, which screwsflialsof furnish the means of adjustmenttofbring;

the arms 1 and 2, {tocentralizeexactly at} 1.1 3

the commencement :of thegraduation upon 5 rangement, neither of the arms 1 1and2, ca vibrate upon its axis withoutyibrating th other anlequal distance for ins movingdni either direction it must wind on .a lportion *1 of one of the straps orsprings 10' andjll, and it cannot do this without at the same; time unwinding it from the hub of the other 1; arm, which, of course,causesthatarniwto. U vibrate an equal distancd, y I ffl w In using these calipers,the arm/7,1 is first; I} 1 turned out of the waytogive anlopportunity .11 If 1 to apply the instrumentin taking the meas-fl l .urement of the article; ,Thearms 1 and 2,1 ,1 having been adjusted inthe yusual :manner; 19 j to the size ofthe article, are then secured; 1 in position bythe ,setscrew 16, and onre moving the instrumentpthe radius may be; read off by holding .thej graduated are ever... l 1

upon one of the ar'msas representedinllFig. 1. It is obvious that by adjusting thestraps; r 10, and 11, the instrument mayg belmadeto I indicate a size which will give a certain... 1 amount of play betweenthe parts whichare to work together, and this adjustment may be varied to suit the varied circumstances 5 of the particular kinds ofiwork inwhich 1 h it may be employed. For the convenience of transportation, the arc may be secured under the indicating arm as shown in Fig. 2. When folded into this position, the parts 5 occupy very little room.

Having thus fully described my said invention, I claim- The combination of the arms 1, and 2,

' Witnesses:

CHARLES D. SUTTON.

E. OHIOHESTER FISHER, V OSGAR B. SUTroN. 

